Tack-pulling machine.



W. C. STEWART. TACK PULL-ING MACHINE. APPLICATION FILED Aua.2,19|5.

Patented Apr. 9,

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WILLIAM C. STEWART, 0F SWAMPSCOTT, MASSACI-IU-SETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO UNITED SHOE MACHINERY CORPORATION, 0F PATERSON, NEW JERSEY, A CORPORATION OF NEW' JERSEY.

TACK-PULLING MACHINE.

Specification of Letters Patent.

Patented Apr.9, 1918,

Application filed August 2, 1915. Serial No. 43,302.

To all whomz't may concern:

Be it known that I, WILLIAM C. STEWART, a subject of the King of Great Britain, residing at Swampscott, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Tack-Pulling Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to tack pulling machines and more particularly to machines of this type employed for removing lasting tacks from a boot or shoe.

Lasting tacks are commonly driven through the lasted upper partially into the last with the heads of the tacks projecting sufliciently to be engaged by a tack pulling tool.

An object of the present invention is to provide an improved machine of a simple and compact construction whichV operates efficiently and rapidly to remove the tacks.

With the above object in view, the several features of the invention consist in certain novel characteristics of construction, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art from the following description.

In the accompanying drawings;

Figure l shows an elevation of a machine embodying the several features of the invention in their preferred forms;

Fig. 2 is an elevation taken at right angles to Fig. l;

Fig. 3 is a longitudinal section in elevation of the head with the tack pulling tool shown in operative relation thereto; and

Fig. 4 is a section on line 4 4, of Fig. 3, looking in the direction of the arrows.

The machine shown in the illustrated embodiment of the invention is provided with a rotary tack pulling tool mounted with its axis of rotation extending substantially in the direction of the tack to be pulled. Means are also provided for positioning the tack initially with relation to the engaging edge of the tool, andfor guiding and supportmg the tack in a substantially rectilinear path during the pulling movement. In the simplast and most efficient form of the mven;

tion which has yet been devised, the tool comprises a stem having a helical shoulder or thread extending upward from its lower end, the thread starting with a lip radial and normal to the axis of the stem at its lower end and located at one side of the axis.

The tack pulling tool 2 is attached in any suitable manner to the adjacent end of a driving shaft 3, and has its lower portion helically threaded as at 4 for a suitable distance down to its lower end where the thread terminates in a lip 5. The shaft 3 is mounted in suitable bearings 6 and is driven by a pulley 7 over which runs a belt connected to and driven from any suitable source of power not shown. A tack positioning and guiding head 9 is adjustably secured to the lower end of a rod 8 by a set screw 10 or other suitable fastening and is provided with a cylindrical bore which receives the tack pulling tool. The lower end of the head 9 is provided with a positioning device consisting of a channeled throat or mouthpiece 11 having an inwardly convergent guideway or channel 12, the function of which is to locate a tack 13 in operative relation to the lower end of the pulling tool 2 so that the engaging lip or lower leading end of the thread 4 will sweep beneath the head of the tack. The lower face of the head 9 and throat piece 12 acts as a bearing and support for the shoe, while the pulling of the tack proceeds. As soon as the rotary tool has engaged beneath the head of the tack 13 the helical shoulder of the thread wedges under the head of the tack, and the latter is extracted in a rectilinear path. The tack is maintained in operative relation to the pulling tool by a guide block 14 which is laterally slidable in a chamber 15 formed for its reception in the head 9. The guide block is permitted to yield laterally through the provision of springs 16 interposed between the rear face of the block and the head which tend to yieldingly maintain the tack in engagement with the helical thread of the pulling tool and guide the tack in a rectilinear path extending in a direction substantially parallel to the axis of rotation ofthe tool. It will be noted that for this purpose the block 14 has a channel 17 formed longitudinally in its face adjacent the helix ofthe tool, the channel being arranged to form a guideway Jfor the head of the tack. The rotation ot` the helical tool carries the tack upwardly untilA it `passes above the upper face ofthe guide block when itis discharged into a cup 18 formed at the upper part of the head 9 and having a discharge mouth 19. The inward movement .ot' the guide block toward the tool is limited by oppositely disposed shoulders formed on the head, as shown clearly in Fig. Ll. The block is retained in the head by a transverse pin 20 secured to the block and having its opposite ends received in slots 21 formed in the head. n

While it is understood that the helical thread A may iave any desired cross sec-l Y tool and at the completion of the tack pull;

ing movement the inclined peripheral suriace tilts the tack and causes it to become quickly dislodged from the tool.

-While it is preferred to employ cic construction and arrangement ot parts shown and described, it Will be understood that this construction and arrangement is not essential except so tar as specified in the claims, and may be changed or modified Without departing from the broader :teatures of the invention.

T he invention having been described, what is claimed is:

l. A tack pulling machine, having, in combination, a rotary tack pulling tool provided With a helical tack engaging surface, and means tor rotating the tool to cause the helical surface to engage and remove a tack.

2. A tack pulling machine, having, in combination, a rotary tack pulling tool having a tack engaging surface constructed and arranged to pull a tack in a direction substantially parallel to the axis o1c rotation ot the tool, and means for rotating the tooly to pull a tack. Y

3. A tack pulling machine. having, in com# bination, a rotary tack pulling tool, means tor rotating the tool to pull a tack, and means for guiding the tack in a path substantially parallel to the axis of the tool "luring the tack pulling movement.

4. A tack pulling machine, having, in combination, a rotary tack pulling tool pro-v vided With a helical tack engaging surface, means for rotating the tool, and a guide for the spe-V 'a path substantially parallel to the positioning the tack to be removed substantially parallel to the axis o' rotationof the tool. if

5. Al tack `pulling machine, having, in combination, a rotary tack pulling tool provided vvith a helical tack engaging surface, means for rotating the tool, and means for guiding the tack in a rectilinear path dur ing the tack pulling operation.

6. A tack pulling machine, having, in combination, a rotary tack pulling tool having a helical tack engaging surtace,'means for rotating the tool to cause the helical surface to engage and pull a 'tack,pandmeans for lpositioning the tack to be removed inthe path of the helical surface. l

7. A tack pulling machine, comprising a head having a tool receiving` chamber and a tack positioning throat, a tack pulling toolY operating in said chamber, and a guide yieldingly supported in the head adjacent the chamber to maintain the tack in contact with the tool.

8. A tack pulling machine comprising a head having a tool receiving chamber and a tack positioning throat, a tack pulling tool operative in said chamber and arranged to engage with a tack positioned in the throat to pull said tack, and a yieldableguide for maintaining the tack in engagement with the tool.

9. A tack pulling machine, having', in combination, a rotary tack pulling toolmeans -for rotating thetool, a head, and a guide yieldingly supported in the head and arranged to guide the tack during the pulling operation. f Y

10. A tack pulling machine, having, in' combination, a rotary tack pulling Ytool, means for rotating the tool, a head provided with a cylindrical bore to receiver the tool and a discharge chute at its upper end, and a guide tor maintaining the tack in engagementy with the tool during the pulling operation arranged to permit the discharge of the tack from the tool into the chute.

11.V A tack pulling machine, having, in combination," a rotary tack pulling tool, means for rotating the tool, and a guiderarranged to yieldingly maintainthe tack in engagement with the tool provided with a longitudinal groove for guiding the tack inV axis of the tool.

12. A tack Vpulling machine, combination, a rotary tack pulling tool,

and means for positioning and guiding the tack during the tack pulling movement in having, 1n

a direction parallel tothe axisofrotation of the tool.

WILLIAM C. STEWART.

Copies of this patent may be obtained for ve cents each. by addressing the Commissioner of lliatexitaQLA 

